7. UNUSUAL FEATURES OF THE PROGRAM
The most important characteristic of the computational method is that it yields an analytic criterion for the magnitude of the time-step. This criterion is such that the time-step automatically expands or contracts, depending on the behavior of the dependent variables within each interval. The use of this criterion quarantees that the accumulated fractional error in each dependent variable is always less than N*E, where N is the number of time-steps and E is an input truncation error parameter.
Also, the code is structured in a form such that reactivity, heat balance, and source options other than those presently available can be incorporated with a minimum of code modification.